I would go for OEM order at a dealer.
I don't think they cannot get the gaskets for you.

But if you are in a hurry and you need to close up the engine asap try applying a 3-4mm thick layer of gasket silicon, let it dry a bit so it starts to feel more like rubber than peanutbutter and then bolt it on the engine and keep your fingers crossed.

Of course that means you need to use a gasket really soon.
Honda uses a gasket there for a reason.
The CBR 1000RR 04 onward instead, doesn't use gaskets on the engine covers....... but that was manufactured that way.

However, you say you installed a new gasket and there was still oil leaking?
That means that the engine cover's mating surface is wounded, scarred or something? otherwise it is not totally flat and it doesn't press the gasket equally in every place around the gasket.
Did you use silicon gasket compound at the cover's rubber surface where the stator wires come out of it?

I would go for OEM order at a dealer.
I don't think they cannot get the gaskets for you.

But if you are in a hurry and you need to close up the engine asap try applying a 3-4mm thick layer of gasket silicon, let it dry a bit so it starts to feel more like rubber than peanutbutter and then bolt it on the engine and keep your fingers crossed.

Of course that means you need to use a gasket really soon.
Honda uses a gasket there for a reason.
The CBR 1000RR 04 onward instead, doesn't use gaskets on the engine covers....... but that was manufactured that way.

However, you say you installed a new gasket and there was still oil leaking?
That means that the engine cover's mating surface is wounded, scarred or something? otherwise it is not totally flat and it doesn't press the gasket equally in every place around the gasket.
Did you use silicon gasket compound at the cover's rubber surface where the stator wires come out of it?

while i agree with Makis, Honda designed it with a gasket for a reason, as long as the RTV silicone/gasket maker you are considering wont react with oils and whatnot, put ya a small even bead/layer on the cover, let it skin over a tad, install the cover but dont torque it down for awhile. let it set up a little further then torque it. a few good ones to use are: Permatex Right Stuff, either grey or black in the cheesewiz can, Victor Reinz Reinzosil in black, or a super grey RTV.... just my $0.02

I've been known to permatex a few things in my days..however if there is a gasket made that should be the first go-to. Make sure both srufaces are clean, clean, clean. No residue from old gaskets. Like mentioned, if there is a rubber seal-gasket interface I like to use a small bead of permatex to seal between and around the rubber seal.

If the mating surfaces are skewed ever so slightly I have used a coat of the proper goo on the gasket. I will lay a small bead, spread it with a small putty knife and assemble it that way.

Another common mis-step is proper assembly with the gasket. Make sure you tighten the bolts evenly.

While the silicone may be a good band aide I don't like using it exclusively on fluid containing cases/reservoirs as the actualy layer created can be quite thin and not very stong under pressure or certain solutions.

You can even get a sheet of comparable gasket material from the auto shop and using the old gasket (if intact) a pencil and a hobby knife you can make a new gasket rather easily.

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